Alright, let's work through 3669 times 5835 step by step
3669 × 5835 = 5835 × (3669)
+ 5835 × 9 resulting in 52515
+ 5835 × 60 that is equal 350100
+ 5835 × 600 resulting in 3501000
+ 5835 × 3000 which equals 17505000

= 21408615
